Well drilling and fishing jar



' June 30, 1925.

J. P. SCHIRNHOFER WELL DRILLING AND FISHING JAR File ad May. 25, 1924Patented June 30, 1925 F I C E JOHN P. SCHIRNHOFER, OF PAINTSV'ILLE,KENTUCKY.

WELL DRILLING AND FISHING JAR.

Application filed May 23,

T0 all whom it may concern:

Be it known that I, JOHN P. SCHIRNHO- FER, a citizen of the UnitedStates, residing at Paintsville, in the county of Johnson and State ofKentucky, have invented certain new and useful Improvements in VvellDrilling and Fishing Jars, of which the following is a specification.

This invention relates to well drilling and fishing jars, and itconsists in the novel features hereinafter described and claimed.

An object of the invention is to provide a jar structure of simple anddurable form and especially adapted to be used in drilling a well tostart the bit in hard formation and which will serve to cause the bittodrill the well hole of uniform diameter. The jar structure may also beused to advantage for loosening a tool which has become stuck in thehole.

A further object of the invention is to provide a jar structure in whichtliense of a manila line is eliminated and in lieu thereof a wire cablesection may be used thus materially strengthening the structure.

A still further object of the invention is to provide a jar structure inwhich the several parts may be readily disconnected from each other andin the event that any of the parts become unservieeable, they may bediscarded and new parts substituted in their stead without dispensingwith all .of the serviceable parts of the structure.

In the accompanying drawing:

Figure 1 is a vertical longitudinal sectional view of the jar structure.

Figure 2 is an enlarged fragmentary detail sectional. view thereof.

Figure 3-is a face view of a collar used in the jar structure.

As illustrated in the accompanying drawing, the well drilling andfishing jar structure comprises a member 1 provided at its upper endwith a. threaded stud 2 adapted to be engaged with a drill rod (notshown) in a usual manner. The member 1 is pro vided with a socket 3which leads in from the lower end thereof. The member 1 is provided atits oppositesides with aligned openings 4 which are spaced above thelower end of the said member and which communicate at their inner endswith the socket 3. A set screw 5 is threaded in the intermediate portionof the member 1. A collar 6 is housed within the socket 3 and the innerend of the screw 5 impinges against the side 1924. Serial No. 715,372.of the collar and holes the same in a fixed position in the socket 3 ofthe member. The collar 6 is provided at its upper side with a recess 7which snugly receives the lower portion of a block 8. The block 8 isprovided with a central opening having converging side walls 9. v

A section of wire cable 10 passes through the collar 6 and through theopening in the block 8 and a wedge 11 is inserted in the upper end ofthe cable, thereby the same and forcing the into close contact with thespreading sides of the cable converging walls 9 of the opening in theblock 8. lidisk 12 is mounted upon the cable 8 below t e collar 6 andbearing balls 13 are interposed between the said disk and the collar. Asleeve 14 is threaded in the lower portion of the socket 3 and isprovided with a shoulder 15 which bears directly against the lower endof the member 1. A coil spring 16 is housed within the socket 3 and isinterposed between the upper end of the sleeve 14 and the under side ofthe disk 12 and serves as means for holding the disk 12 and the bearingballs 13 toward the collar 6. The cable section 10 is threaded throughthe sleeve 14. The sleeve 14 is provided at its lower end with adiametrically enlarged socket 17 which receives the upper end of thesleeve 18. The sleeve 18 may turn in the socket of the sleeve 14. vInthe event that the cable section 10 should elongate, said slteves mayhave relative longitudinal movement and when the relative longitudinalmovement becomes excessive, the nut 5 may be loosened whereby the spring16 will take up the slack in the cable and the sleeves will be drawn inclose contact with each other and the nut 5 may be retightened. The.sleeve 18 is provided with a shoulder 19 which bears directly againstthe lower end of the sleeve 14. The cable section 10 is also threadedthrough the sleeve 18. The sleeve 18 is provided at its lower end with asocket 20 which snugly receives a block 21. The block 21 is providedwith a central opening 22 having con verging side Walls and the lowerend of the cable section 10 passes through the opening in the block 21.A wedge 23 is inserted in the lower end of the cable section 10 andspreads the same against the converging walls of the opening 22. Thelower end of the sleeve 18 is internally threaded as at 24 and a toolbit (not shown) may be engaged with the sleeve 18 at the thread 24 in ausual rod of undue strain and stress.

manner. When it'is desired to unscrew the sleeve 14 from the member 1, arod (not shown) may be passed through'the aligned openings 4 whereby oneend of the spring 16 may bear against the said rod and consequently whenthe sleeve 14 is unscrewed from the member 1, the spring 16 will beretained in the same member. 7

The structural arrangement is such that the spring 16 will at all timeshold the members of the anti-friction or ball bearing structure inproper position with relation to each other and will at all times holdthe cable 10 in a stretched or taut condition whereby the sleeves 14 and18 are held against relative longitudinal movement and at the same timethe said sleeves may turn with relation to each other.

The operation of the device is as follows: The threaded stud 2 at thetop of the device is tapped into the lower end of the operating rod of adrilling machine of conventional form. The machine to which the deviceis attached is of the reciprocating type and it is obvious that thedevice is moved up and down in the hole. During this verticalreciprocatory movement, the lower sleeve 18, to which the drill (notshown) 'is attached is permitted to swivel through the medium of thecable and a ball bearing structure. Also, the sections 18 and 14 arepermitted to move longitudinally with respect to each against the actionof the spring 16 to relieve the operating drill Practice has shown thatin the ordinary solid onepiece structure now commonly used, the

hole bored or drilled in the ground 1s sometimes quite irregular,however, by pro' viding a structure wherein the parts are longitudinallymovable with respect to each otheragainst the tension of the spring andpermitting these parts to swivel with respect to each other, it has beenfound that a drill hole of uniform diameter is the result.

Whereas the device is given a comparatively short stroke while drillingholes, the stroke is increased somewhat when it is used as a fishingjar. In using the device for the purpose last stated and assuming forinstance that the bit is down feet in the hole and gets stuck, it takesa one thousand comparatively hard jerk to loosen the bit because theweight of an ordinary device of the character described is abouttwenty-' five hundred pounds. Obviously, without the extensible springfeature of my device, the machine above the surface would be subjectedto considerable strain, but by permitting the swivel and slidingconnection between the parts of the device, the machine is relieved ofshocks and jars. As soon however as the spring is tightly compressedand'further relative sliding parts of the device is stopped, a furtherpull on the operating rod, or line, whichever is used, servfis to loosenthe bit which has become stuc Having described the invention, what isclaimed is:

1. A well drilling jar structure comprising a socket member, a sleevescrewed therein, and provided at its lower end with a socket, a secondsleeve fitting snugly in the socket-of the first mentioned sleeve andprovided at its lower end with a socket, a block secured in the socketof the first mentioned member, a block located in the socket of thesecond mentioned sleeve, a wire cable section secured at its ends in theblocks and passing through the sleeves, a disk housed in the socket ofthe first mentioned member, and a spring housed in the socket of thefirst mentioned member and interposed between said disk and the firstmentioned sleeve.

2. A well drilling jar structure comprising a socket member, a collarlocated there- 1n, her, a block carried by the collar, a disk housed insaid member, bearing balls interposed between the disk and the collar,sleeves having sliding engagement with each other, one ofthe saidsleeves being screwed in the socket member, a spring interposed betweenthe last mentioned sleeve and the disk and housed within the socket, anda wire cable passing through the collar, the disk, the spring, and thesleeves, and secured at one end to the lower sleeve and at the other endto the block.

In testimony whereof I aflix my signature.

(JOHN P. SCHIBNHOFER.

means for fixing said collar in said mem-

